Android - Reading images of QR codes displayed in the browser

You can do this from the Browser itself using "QR Droid". Search for it and install it. After that:

• In the Browser, long-click the image and select "Save image"
• After downloaded, open image from notification bar
• Select Menu > Share > "Decode with QR Droid"

Barcode Generator / Reader is an app that reads and decodes QR codes from a file.

Also, you can bookmark this web based reader: ZXing Decoder Online, then when you come across a QR code, long-press on it, copy the image URL, then paste it into the linked page.